depolo@eniac.seas.upenn.edu (Jeff DePolo) (02/07/89)
The Pro-2004 was on sale for a few weeks last summer. Don't hold your breath for another sale. Typically Radio Shack only puts stuff on sale that aren't selling well. Unfortunately, the PRO-2004 has been doing OK at it's $430 price. However, there is a shortcut! Grove Enterprises (the publisher of Monitoring Times, a pretty good magazine) sells it at $389, including an instruction sheet that tells you how to modify it for cellular coverage. If anybody wants the address/ordering info/telephone number for Grove, let me know and I'll find it for you. By the way, I have a 2004 (that I bought at full price) and I love it (just a little info for those that are thinking about buying one). I've done the following mods and anybody that is interested in how to do them can send me mail: Cellular coverage Turbo-Scan 400 memory channels Carrier-detection light Remote control (scan, manual, search up/down - other keys are just as easy to duplicate) Tape On/Off relay (for use with the "remote" jack on a tape player to turn it on and off when a carrier is found either in search or scan mode). Happy scanning! --- Jeff +----------------------------------------------+------------------------------+ | Jeff DePolo [depolo@eniac.seas.upenn.edu] | o The best things in life | | => The University of Pennsylvania <= | come in six-packs. | | Class of 1991 - Computer Science Engineering | o Life begins at 85 MPH. | +----------------------------------------------+ o It's not illegal if they | | DISCLAIMER: Someone else used my account. | don't catch you. | +----------------------------------------------+------------------------------+
john@anasaz.UUCP (John Moore) (02/07/89)
In article <7706@netnews.upenn.edu> depolo@eniac.seas.upenn.edu (Jeff DePolo) writes:
]By the way, I have a 2004 (that I bought at full price) and I love it
](just a little info for those that are thinking about buying one).
I think the Pro-2004 is a heck of a good scanner. However, one problem
that it has is front-end desense. On two that I have tested, they
lost 38dB (!!!) of sensitivity when connected to a good antenna
that was letting in -15dBm of FM signals (sensitivity loss was on VHF-Hi
Band). Turning on the attenuator on the back actually improved sensitivity
by 28 dB. I have found that using the radio shack FM reject filter in
front of the scanner seems to help, but it is 75 ohm with wierd (F)
connectors, which is a bit of a kludge.
]
]I've done the following mods and anybody that is interested in how to
]do them can send me mail:
]
]Cellular coverage
]Turbo-Scan
]400 memory channels
]Carrier-detection light
Please post
]Remote control (scan, manual, search up/down - other keys are just as easy
]to duplicate)
Please post!
]Tape On/Off relay (for use with the "remote" jack on a tape player to
]turn it on and off when a carrier is found either in search or scan
]mode).
Please post
--
John Moore (NJ7E) mcdphx!anasaz!john asuvax!anasaz!john
(602) 861-7607 (day or eve)
The opinions expressed here are obviously not mine, so they must be
someone else's. :-)rfc@briar.philips.com (Robert Casey;6282;3.57;$0201) (02/09/89)
In article <1555@anasaz.UUCP> john@anasaz.UUCP (John Moore) writes: >I think the Pro-2004 is a heck of a good scanner. However, one problem >that it has is front-end desense. On two that I have tested, they >lost 38dB (!!!) of sensitivity when connected to a good antenna >that was letting in -15dBm of FM signals (sensitivity loss was on VHF-Hi >Band). Turning on the attenuator on the back actually improved sensitivity >by 28 dB. I have found that using the radio shack FM reject filter in >front of the scanner seems to help, but it is 75 ohm with wierd (F) >connectors, which is a bit of a kludge. You could try making a transmission line stub trap. Get a T coax connector and put it in the antenna coax line, and connect a length of coax cut to the equasion: length = 2953 V where V is velocity factor (0.66) ------- f(MHz) length is in inches for an open ended stub. It comes out to 19.5 inches to trap out 100Mhz. Only problem is that you'll also trap out 300 Mhz, 500 Mhz, etc. Use 1/2 the above length if you want a shorted end stub. 73 de WA2ISE